Disturbing Dog Photo
Snopes lists this as "undetermined" but it's presented as a case of a pit bull vs. porcupine (disturbing photo but not as bad as the guy with his head on a stake).
I've heard of dogs getting dozens of quills but this many? Fortunately my experience with dogs vs. wildlife is restricted to possums, rats, raccoons, deer, fleas, and ticks. (Thank God no skunks.)